The target cells of glucagon are ____
a. liver cells
b. skeletal muscle cells
c. fat cells
d. intestinal cells
e. stomach cells
ANSWER: a
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What is the key factor determining whether or not attenuation will occur when transcription of the E. coli trp operon has been initiated?
A. The trp operon repressor B. The level of tryptophan in the environment C. The activity level of adenyl cyclase D. The level of trp-tRNA that is charged with tryptophan
The most common form of hemophilia is a defect in blood clotting factor VIII, which is caused by a recessive form of a gene carried on the X chromosome. A girl is born with hemophilia. Both parents have normal phenotype
Which of the following might explain this girl's hemophilia? A. A nondisjunction event in sperm production resulted in her receiving X and Y chromosomes from her father, and an X from her mother; she is XXY. B. Nondisjunction during egg formation resulted in her receiving no X chromosome from her mother, but an X from her father; she is XO. C. Nondisjunction during sperm formation resulted in her receiving no sex chromosome from her father and an X chromosome from her mother; she is XO. D. Nondisjunction during egg formation resulted in her receiving two X chromosomes from her mother and an X chromosome from her father; she is XXX. E. She inherited an X chromosome from her father and the X carrying the defective allele from her mother.
A virion is a(n)
A. pathogenic virus. B. subviral particle. C. complete, extracellular virus particle. D. enveloped virus particle.
Which statement about sickle cell anemia is false?
A) Individuals who are heterozygous for the sickle cell allele cannot make hemoglobin. B) The sickle cell hemoglobin molecule contains an amino acid substitution. C) The hemoglobin molecules of an individual with sickle cell anemia clump together. D) The red blood cells of an individual with sickle cell anemia distort and elongate.